ZQ topological invariants for Polyacetylene, Kagome and Pyrochlore lattices

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Published 30 June 2011 Europhysics Letters Association
, , Citation Y. Hatsugai and I. Maruyama 2011 EPL 95 20003 DOI 10.1209/0295-5075/95/20003

0295-5075/95/2/20003

Abstract

Adiabatic ZQ invariants by quantized Berry phases are defined for gapped electronic systems in d-dimensions (Q=d+1). This series includes Polyacetylene, Kagome and Pyrochlore lattice, respectively for d=1, 2 and 3. The invariants are quantum Q-multimer order parameters to characterize the topological phase transitions by the multimerization. This fractional quantization is protected by the global ZQ equivalence even with particle-particle interaction. As for the chiral symmetric case, a topological form of the Z2 invariant is explicitly given as well.

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